package com.example.demo.config;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.type.TypeFactory;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.SerializationException;

import java.nio.charset.Charset;

/**
 * Redis使用FastJson序列化
 *
 * @author sg
 */
public class FastJsonRedisSerializer<T> implements RedisSerializer<T>
{

  public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");

  private Class<T> clazz;

  static
  {
    ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
  }

  public FastJsonRedisSerializer(Class<T> clazz)
  {
    super();
    this.clazz = clazz;
  }

  @Override
  public byte[] serialize(T t) throws SerializationException
  {
    if (t == null)
    {
      return new byte[0];
    }
    return JSON.toJSONString(t, SerializerFeature.WriteClassName).getBytes(DEFAULT_CHARSET);
  }

  @Override
  public T deserialize(byte[] bytes) throws SerializationException
  {
    if (bytes == null || bytes.length <= 0)
    {
      return null;
    }
    String str = new String(bytes, DEFAULT_CHARSET);

    return JSON.parseObject(str, clazz);
  }


  protected JavaType getJavaType(Class<?> clazz)
  {
    return TypeFactory.defaultInstance().constructType(clazz);
  }
}